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Campanula (Canterbury Bells)

Campanula 'Champion' series grown through horizontal trellis.

Campanula ‘Champion’ series grown through horizontal trellis. Click image for larger view.

Campanula medium


The traditional Canterbury Bells varieties are biennials, requiring a cold period for flowering.

  • New varieties have been developed (Champion series) that require no cold treatment and will flower in the first season from seed.
  • Seeds germinate in 14 to 18 days at 65 to 70 F. Leave them on the soil surface or cover lightly.
  • Sowing in early February and transplanting in mid-April should result in flowering in the tunnel in mid-June.

Plant Growing:

  • Champion series is a quantitative long day plant, so restrict daylength to 12 hours in the seedling stage to prevent early flowering and short stems.
  • Number of stems per plant depends on spacing. At 4 to 6 in., plants will produce one stem. At wider spacing, plants can produce 6 to 8 branches.
  • Plants grow best in cool conditions, so should be transplanted into the tunnel in early spring, with low tunnel for late frost protection.
  • Campanula ‘Champion’ fills a market gap in tunnel production between larkspur, stock and early lisianthus.


  • Champion series are so far the only annualC. medium.
  • Flower color of the lines vary from white to blue, lavender and pink.

Posthavest Handling:

  • Expect a vase life of 7 to 14 days at room temperature.

For more information, see: Armitage, A.M. and J.M. Laushman. 2003. Specialty Cut Flowers, 2nd Edition. Timber Press, 586 pp. Available through ASCFG.

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